Short answers, pulled from the story.
Halmstad publisher Carl August Linder founded the Nordisk familjebok encyclopedia and hired linguist Carl Johan Lundström in 1874 to create a six-volume work. Linder designed the editorial team and assembled experts who submitted article proposals under his strict direction.
Twenty volumes appeared between 1876 and 1899 under the name Idun edition with a picture of Idun, the Norse mythologic goddess of spring and rejuvenation, adorning its cover. The first ten volumes contained material not found in later editions and included an example at the end of the Berlin article within the second volume from 1878.
Thirty-eight volumes emerged between 1904 and 1926 bearing an owl image on their covers which gave the work its popular nickname Uggleupplagan. Over twenty thousand articles on Swedish Wikipedia are based directly on this edition as publishers aimed to create a definitive reference source for Nordic readers.
Three supplementary volumes followed in 1937, 1938, and 1939 covering events like the Spanish Civil War and including heavy updates on Adolf Hitler. No mention exists regarding Germany's war on Poland or later events while a second printing occurred between 1941 and 1944 without essential changes.
Project Runeberg at Linköping University now hosts fully available digital forms of the public domain editions containing forty-five thousand pages accessible to researchers worldwide. Finnish Wikipedia relies heavily on these public domain versions for reference material and Lars Aronsson wrote a preface to the 2003 Digital Edition that explains their significance.